top of page
mass
'no magic to the mole'
amount
molar mass
concentration
solution volume
gas volume
molar gas volume
Avogadro
constant, L
number of
entities, N
Now try the following question.
11.3 CALCULATING AN EMPIRICAL FORMULAE FROM MASSES OF CONSTITUENTS
For a compound, analytical data might be presented as masses of constituent elements rather than mass % compositions. In such cases we do not have to decide on a basis for the calculation as normally a sample mass will be provided or a total implied.
These problems solve with the same routine as those tackled in section 11.2 above.
WORKED EXAMPLE 11
5.00 g of a gaseous hydrocarbon on analysis was found to contain 4.00 g of carbon. Calculate its empirical formula.
[ Ar(H) = 1.01; Ar(C) = 12.01 ]
Solution
bottom of page